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Appendix D - Abbreviations
A
PPENDIX
A
ACO:
Alarm Cutoff
AIS:
Alarm Indication Signal
ALM:
Alarm
AMI:
Alternate Mark Inversion
ASCII: American Standard Code for Information Interchange
B
B8ZS: Binary 8 Zero Substitution
BER:
Bit Error Rate
C
CDU:
Customer Doubler
CLOC: Customer Local Loopback
CO:
Central Office
CR:
Critical Alarm
CREM: Customer Remote Loopback
D
DCE:
Data Communication Equipment
DS3:
Digital Signal, level Three
DSX-1: Digital Signal Cross-connect Level 1
DTE:
Data Terminal Equipment
E
EMI:
ElectroMagnetic Interference
ESD:
Electrostatic Discharge
F
FGND: Frame Ground
FLB:
Facility Loopback
H
HCA:
HiGain Cable Assembly
HDSL: High-bit-rate Digital Subscriber Line
HFA:
HiGain Fan Assembly
HLU:
HiGain Line Unit
96
D - A
BBREVIATIONS
January 12, 2001
HMU: HiGain Management Unit
HRU:
HiGain Remote Unit
HTC:
HiGain Test Card
HXU:
HiGain Multiplexer Unit
I
IP:
Internet Protocol
IS:
In-Service
L
LED:
Light Emitting Diode
LIU:
Line Interface Unit
LLOS: Local Loss of Signal
M
MAL1: Margin Alarm 1
MAL2: Margin Alarm 2
MDF: Main Distribution Frame
MJ:
Major Alarm
MN:
Minor Alarm
MOP: Method of Procedure
N
NDU:
Network Loopback
NEBS: Network Equipment-Building System
NLOC: Network Local Loopback
NREM: Network Remote Loopback
O
OOS:
Out of Service
R
RFL:
Remote Facility Loopback
RLOS: Remote Loss of Signal
RTL:
Remote Terminal Loopback
S
S1:
Slide Switch
LTPH-SM-1014-03, Issue 3
HMS-358 List 1 and List 2
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